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A double convex thin lens made of glass ...

A double convex thin lens made of glass (refractive index `mu = 1.5`) has both radii of curvature of magnitude 20 cm . Incident light rays parallel to the axis of the lens will converge at a distance L such that

A

L=20 cm

B

L=10 cm

C

L=40 cm

D

`L=(20)/(3)` cm

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The correct Answer is:
A
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